1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "QuotaUtils.h"
18
19 #include <fstream>
20 #include <unordered_map>
21
22 #include <sys/quota.h>
23
24 #include <android-base/logging.h>
25
26 #include "utils.h"
27
28 namespace android {
29 namespace installd {
30
31 namespace {
32
33 std::recursive_mutex mMountsLock;
34
35 /* Map of all quota mounts from target to source */
36 std::unordered_map<std::string, std::string> mQuotaReverseMounts;
37
FindQuotaDeviceForUuid(const std::string & uuid)38 std::string& FindQuotaDeviceForUuid(const std::string& uuid) {
39 std::lock_guard<std::recursive_mutex> lock(mMountsLock);
40 auto path = create_data_path(uuid.empty() ? nullptr : uuid.c_str());
41 return mQuotaReverseMounts[path];
42 }
43
44 } // namespace
45
InvalidateQuotaMounts()46 bool InvalidateQuotaMounts() {
47 std::lock_guard<std::recursive_mutex> lock(mMountsLock);
48
49 mQuotaReverseMounts.clear();
50
51 std::ifstream in("/proc/mounts");
52 if (!in.is_open()) {
53 return false;
54 }
55
56 std::string source;
57 std::string target;
58 std::string ignored;
59 while (!in.eof()) {
60 std::getline(in, source, ' ');
61 std::getline(in, target, ' ');
62 std::getline(in, ignored);
63
64 if (source.compare(0, 11, "/dev/block/") == 0) {
65 struct dqblk dq;
66 if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), source.c_str(), 0,
67 reinterpret_cast<char*>(&dq)) == 0) {
68 LOG(DEBUG) << "Found quota mount " << source << " at " << target;
69 mQuotaReverseMounts[target] = source;
70 }
71 }
72 }
73 return true;
74 }
75
IsQuotaSupported(const std::string & uuid)76 bool IsQuotaSupported(const std::string& uuid) {
77 return !FindQuotaDeviceForUuid(uuid).empty();
78 }
79
GetOccupiedSpaceForUid(const std::string & uuid,uid_t uid)80 int64_t GetOccupiedSpaceForUid(const std::string& uuid, uid_t uid) {
81 const std::string device = FindQuotaDeviceForUuid(uuid);
82 if (device == "") {
83 return -1;
84 }
85 struct dqblk dq;
86 if (quotactl(QCMD(Q_GETQUOTA, USRQUOTA), device.c_str(), uid,
87 reinterpret_cast<char*>(&dq)) != 0) {
88 if (errno != ESRCH) {
89 PLOG(ERROR) << "Failed to quotactl " << device << " for UID " << uid;
90 }
91 return -1;
92 } else {
93 #if MEASURE_DEBUG
94 LOG(DEBUG) << "quotactl() for UID " << uid << " " << dq.dqb_curspace;
95 #endif
96 return dq.dqb_curspace;
97 }
98 }
99
GetOccupiedSpaceForGid(const std::string & uuid,gid_t gid)100 int64_t GetOccupiedSpaceForGid(const std::string& uuid, gid_t gid) {
101 const std::string device = FindQuotaDeviceForUuid(uuid);
102 if (device == "") {
103 return -1;
104 }
105 struct dqblk dq;
106 if (quotactl(QCMD(Q_GETQUOTA, GRPQUOTA), device.c_str(), gid,
107 reinterpret_cast<char*>(&dq)) != 0) {
108 if (errno != ESRCH) {
109 PLOG(ERROR) << "Failed to quotactl " << device << " for GID " << gid;
110 }
111 return -1;
112 } else {
113 #if MEASURE_DEBUG
114 LOG(DEBUG) << "quotactl() for GID " << gid << " " << dq.dqb_curspace;
115 #endif
116 return dq.dqb_curspace;
117 }
118
119 }
120
121 } // namespace installd
122 } // namespace android
123